Portal is a first-person puzzle game developed by Valve that challenges players to think creatively and solve complex environmental puzzles using a unique physics-based mechanic. The game is set in the mysterious Aperture Science Enrichment Center, where the player takes on the role of Chell, a test subject navigating a series of experimental chambers. Armed with the Portal Gun, a device capable of creating two linked portals on specific surfaces, players must use momentum, spatial awareness, and logic to traverse rooms, avoid hazards, and reach designated exits. Each puzzle builds on previously learned mechanics, gradually introducing new elements such as moving platforms, energy balls, switches, and deadly traps that require increasingly clever solutions. As the game progresses, Portal blends its puzzle gameplay with a darkly humorous narrative delivered through environmental storytelling and the iconic artificial intelligence antagonist, GLaDOS. Her sarcastic commentary and unsettling behavior add personality and tension to the experience while subtly revealing details about the facility and its experiments. Beyond simply completing test chambers, players uncover hidden areas and secrets that hint at a deeper story beneath the sterile laboratory setting. Portal stands out for its minimalist design, intelligent level progression, and innovative mechanics, offering a memorable experience that rewards experimentation, problem-solving, and curiosity while delivering a compelling atmosphere and story without relying on traditional combat.